Well, yesterday I only just started messing with the yafray engine and I am very pleased with it’s performance compared to the blender internal engine.
how on earth can i get the caustics in the first place…without a photon lamp? yes, i’m using a photon lamp and yes, it’s calculating the photons/caustics but not the way i want it.
There have been few threads about Yafray caustics lately, read them and learn. The .blend The Last Rookie send is also good reference for your future experiments.